Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Akihiro Kondo0
Yoshiyuki Tode0
Hideyasu Muraoka0
Date of Patent
March 12, 2024
0Patent Application Number
180226640
Date Filed
July 29, 2021
0Patent Citations
Patent Primary Examiner
Patent abstract
A hydraulic excavator drive system includes: a first pump connected to a head-side chamber of a boom cylinder; and a second pump that supplies hydraulic oil to at least one of an arm cylinder or a bucket cylinder. The first pump is driven by an electric motor. The drive system further includes: a first switching valve located on a rod-side line; and a second switching valve located on a relay line. The first switching valve opens the rod-side line at a boom raising operation, but blocks the rod-side line except at the boom raising operation. The second switching valve blocks the relay line at the boom raising operation, but opens the relay line at a vehicle body lifting operation.
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